This bolt has a square shoulder under a rounded head (Mushroom Head) which resists turning when the nut is tightened or removed. The bolt is driven into a hole the same size as the shank and then hammered the rest of the way, where the square shoulder locks firmly into place.
These screws consist of an threaded cylindrical shaft that tapers to a point, with a Hex head at the other end. When these are driven into timber, the threads bite into the wood, while the head stops the screw from going all the way through as it provides compression.
This bolt has a square shoulder under a rounded head (Mushroom Head) which resists turning when the nut is tightened or removed. The bolt is driven into a hole the same size as the shank and then hammered the rest of the way, where the square shoulder locks firmly into place.
These screws consist of an threaded cylindrical shaft that tapers to a point, with a Hex head at the other end. When these are driven into timber, the threads bite into the wood, while the head stops the screw from going all the way through as it provides compression.